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United States Patent | 5,151,197 |
Smith ,   et al. | September 29, 1992 |
Apparatus (1) for treating fluid, in this case wastewater, comprising a treatment vessel or tank (2), means (3) to supply wastewater to be treated in a pulsed sequence to the vessel, and means (4) to supply treatment fluid, in this case comprising oxygen to the vessel or tank (2) in a pulsed sequence opposite to the pulsed sequence of the supply of wastewater to be treated.
Inventors: | Smith; Alan J. (Hemel Hempstead, GB2); Quinn; Jennifer J. (London, GB2) |
Assignee: | Thames Water Utilities Limited (GB) |
Appl. No.: | 576526 |
Filed: | December 7, 1990 |
PCT Filed: | February 13, 1990 |
PCT NO: | PCT/GB90/00235 |
371 Date: | December 7, 1990 |
102(e) Date: | December 7, 1990 |
PCT PUB.NO.: | WO90/09353 |
PCT PUB. Date: | August 23, 1990 |
Feb 14, 1989[GB] | 8903292 |
Current U.S. Class: | 210/758; 210/139; 210/220; 210/258; 210/274; 210/760 |
Intern'l Class: | C02F 001/72 |
Field of Search: | 210/199,201,220,258,758,760,138,139,274 |
3654149 | Apr., 1972 | Hedgpeth | 210/758. |
3867290 | Feb., 1975 | Mackey | 210/199. |
3925208 | Dec., 1975 | Yost | 210/199. |
4007118 | Feb., 1977 | Ciambrone | 210/760. |
4278546 | Jul., 1981 | Roesler | 210/199. |
4325823 | Apr., 1982 | Graham | 210/199. |
4627923 | Dec., 1986 | Ross | 210/758. |